刚性桩加固软土路基失稳破坏数值模拟

发布时间：2018-08-14 16:45

【摘要】：为控制路堤的整体稳定性,刚性桩现已常用于软土路基的加固。本文引入了桩体的断开机制,采用有限元软件ABAQUS对刚性桩加固软土路基的失稳破坏模式进行分析,相较于传统的数值模拟方法,体现了路堤荷载作用下,刚性桩的渐次失稳破坏过程。在此基础上,考虑桩体可能优先发生的弯曲破坏,提出将临界比例n作为判断桩体优先发生剪切破坏或弯曲破坏的临界值,并将其作为本文桩体断开机制的终止判别条件,合理地规避了数值模拟软件定量计算存在的较大误差。最后,将本文数值模拟与传统的数值模拟、等效砂桩法的数值模拟进行对比,结果反应出本文数值模拟方法的合理性与可靠性,工程上可通过增大前排桩的抗弯强度或限制桩体的水平位移,提高路堤的整体稳定性。
[Abstract]:In order to control the overall stability of embankment, rigid pile is often used to reinforce soft soil subgrade. In this paper, the breaking mechanism of pile body is introduced, and the failure mode of soft soil roadbed strengthened by rigid pile is analyzed by using finite element software ABAQUS. Compared with the traditional numerical simulation method, it reflects the effect of embankment load. The gradual failure process of rigid pile. On this basis, considering the bending failure which may occur preferentially, the critical ratio n is put forward as the critical value to judge the shear failure or bending failure of the pile, and it is regarded as the termination criterion of the disconnection mechanism of pile body in this paper. The large error in quantitative calculation of numerical simulation software is avoided reasonably. Finally, the numerical simulation of this paper is compared with the traditional numerical simulation and the numerical simulation of the equivalent sand pile method. The results show the rationality and reliability of the numerical simulation method in this paper. In engineering, the overall stability of embankment can be improved by increasing the flexural strength of the front row pile or limiting the horizontal displacement of the pile body.
【作者单位】：福州大学环境与资源学院;福州大学土木工程学院;
【基金】：国家自然科学基金项目(41572253)资助
【分类号】：U416.16

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